Bolens 21B-121R765 Owner's manual

Brand: Bolens

Model: 21B-121R765

Category: Garden tools

Type: Owner's manual

BL410

2-Cycle Garden

Cultivator

SAVE THESE mNSTRUCTmONS DO NOT THROW AWAY

PIN769-01404 (1/05)

THANK YOU

Thank you for buying this quaHity product, This modern

outdoor power tooH wiHHprovide many hours of usefuH

service, You wiHHfind it to be a great Habor-saving device,

This operator's manuaH provides you with easy-to-

understand operating instructions, Read the whoHe

manuaH and foHHowaHHthe instructions to keep your new

outdoor power tooHin top operating condition.

PRODUCT REFERENCES, mLLUSTRATmONS

AND SPECmFmCATmONS

AHHinformation, iHHustrations, and specifications in this

manuaH are based on the Hatest product information

avaiHabHeat the time of printing, We reserve the right to

make changes at any time without notice.

Reserved.

SERVICE iNFORMATiON

Service on this unit both within and after the warranty

period should be performed only by an authorized and

approved service dealer,

For service call 1-800-345-8746 in the United States, or

1-800-668-1238 in Canada to obtain a list of authorized

service dealers near you.

DO NOT RETURN THE UNiT TO THE RETAILER.

PROOF OF PURCHASE WiLL BE REQUIRED FOR

WARRANTY SERVICE.

Before beginning, locate the unit's model plate. It lists

the model and serial numbers of your unit. Refer to the

sample plate below and copy the information for future

reference.

Medel Number

Serial Nnmber

-k \ ParentPartNambec

_LL_Or)EL: /

S/N : ITEM : f

TABLE OF CONTENTS

Service Information ......................... 2

Rules for Safe Operation ..................... 3

Know Your Unit ............................ 6

Assembly Instructions ....................... 7

Oil and Fuel Information ...................... 8

Starting/Stopping Instructions ................. 9

Operating Instructions ...................... 10

Maintenance and Repair Instructions ........... 11

Cleaning and Storage ....................... 14

Accessories and Replacement Parts ........... 14

TroubHeshooting Chart ...................... 15

Specifications ............................. 16

Warranty Information ....................... 20

Parts List .................... Inside Back Cover

SPARK ARRESTOR NOTE

NOTE: For users on U.S. Forest Land and in the

states of California, Maine, Oregon and Washington.

All U,S. Forest Land and the state of California (Public

Resources Codes 4442 and 4443), Oregon and

Washington require, by Haw that certain internal

combustion engines operated on forest brush and/or

grass-covered areas be equipped with a spark arrestor,

maintained in effective working order, or the engine be

constructed, equipped and maintained for the prevention

of fire. Check with your state or local authorities for

regulations pertaining to these requirements. Failure to

follow these requirements could subject you to liability or

a fine, This unit is factory equipped with a spark

arrestor, if it requires replacement, ask your LOCAL

SERVICE DEALER to install the Accessory Part

#?53-04925 Spark Arrestor Kit,

Copy the model and parent

part number here:

Copy the serial number

here:

Make sure you carefully read and understand this manual

before starting or operating this equipment.

THIS PRODUCT IS COVERED BY ONE OR MORE U.S.

PATENTS. OTHER PATENTS PENDING.

CALiFORNiA PROPOSiTiON 65 WARNING

THE ENGINE EXHAUST FROM THiS

PRODUCT CONTAINS CHEMICALS

KNOWN TO THE STATE OF CALiFORNiA

TO CAUSE CANCER, BIRTH DEFECTS

OR OTHER REPRODUCTmVE HARM.

SYMBOL MEANING ]

The purpose of safety symbols is to attract your

attention to possible dangers. The safety symbols,

and their explanations, deserve your careful attention

and understanding. The safety warnings do not by

themselves eliminate any danger. The instructions or

warnings they give are not substitutes for proper

accident prevention measures.

SYMBOL MEANING

SAFETY ALERT: Indicates

danger,

warning or caution. Attention [s required [n

order to avoid serious personal injury. May

be used [n conjunction with other symbols

or pictographs.

NOTE: Advises you of information or instructions vital to

the operation or maintenance of the equipment.

Read the Operator's Manual(s} and follow all

warnings and safety instructions.

Failure to do so can result in serious injury to the

operator and/or bystanders.

FOR QUESTIONS, CALL 1-800-345-8746 in the

United States, or 1-800-668-1238 in Canada

DANGER: Failure to obey a

safety warning will

result [n serious injury to yourself or to

others. Always follow the safety precautions

to reduce the risk of fire, electric shock and

personalinjury.

WARNING: Fa,uretO obey a

safety warning can

result in injury to yourself and others.

Always follow the safety precautions to

reduce the risk of fire, electric shock and

personalinjury.

, Failure to obey a

• safety warning may

result in property damage or personal injury

ourself or to others. Always follow the

precautions to reduce the risk of fire,

electric shock and personal injury.

, IMPORTANT SAFETY INSTRUCTIONS,

READ ALL INSTRUCTIONS

BEFORE OPERATING

WARNING: When using the unit,

you must follow the

the safety of the operator and any bystanders.

Please keep these instructions for later use.

Read the instructions carefully. Be familiar with the

controls and proper use of the unit.

, Do not operate this unit when tired, ill, or under the

influence of alcohol, drugs, or medication.

• Children and teens under the age of 15 must not use

the unit, except for teens guided by an adult.

• All guards and safety attachments must be installed

properly before operating the unit.

• Inspect the unit before use. Replace damaged parts.

Check for fuel leaks. Make sure all fasteners are in

place and secure. Replace parts that are cracked,

chipped, or damaged in any way. Do not operate the

unit with loose or damaged parts.

Carefully inspect the area before starting the unit.

Remove all debris and hard or sharp objects such as

glass, wire, etc.

Be aware of the risk of injury to the head, hands and

feet.

Clear the area of children, bystanders, and pets. At a

minimum, keep all children, bystanders, and pets

outside a 50 feet (15 m.) radius: there still may be a

risk to bystanders from thrown objects. Bystanders

should be encouraged to wear eye protection. If you

are approached, stop the unit immediately.

Squeeze the throttle control and check that it returns

automatically to the idle position. Make all adjustments

or repairs before using unit.

SAFETY WARNINGS FOR GAS UNITS

WARNING: Gasoline is higHy

flammable, and its

vapors can explode if ignited. Take the

following precautions:

• Store fuel only in containers specifically designed and

approved for the storage of such materials.

• Avoid creating a source of ignition for spilled fuel. Do

not start the engine until fuel vapors dissipate.

• Alwaysstoptheengineandallowittocoolbeforefilling

thefueltank.Neverremovethecapofthefueltank,or

addfuei,whentheengineishot.Neveroperatetheunit

withoutthefuelcapsecurelyinplace.Loosenthefuel

tankcapslowlytorelieveanypressureinthetank.

• Mixandaddfuelinaclean,well-ventilatedoutdoorarea

wheretherearenosparksorflames.Slowlyremovethe

fuelcaponlyafterstoppingengine.Donotsmokewhile

fuelingormixingfuel.Wipeupanyspilledfuelfromthe

unitimmediately.Alwayswipeunitdrybeforeusing.

Movetheunitatbast30feet(9.1m)fromthefueling

sourceandsitebeforestartingtheengine.Donot

smokeorallowsparksandopenflamesnearthearea

whileaddingfueloroperatingtheunit.

WHmLE OPERATmNG

Never start or run the unit inside a closed room or

building. Breathing exhaust fumes can kill. Operate

this unit only in a well ventilated outdoor area.

• Wear safety glasses or goggles that are marked as

meeting ANSi Z87.1-1989 standards. Also wear

ear/hearing protection when operating this unit. Wear

a face or dust mask if the operation is dusty. Long

sleeve shirts are recommended.

• Wear heavy, long pants, boots and gloves. Do not

wear loose clothing, jewelry, short pants, sandals or

go barefoot. Secure hair above shoulder level.

• This unit has a clutch. The tines remains stationary

when the engine is idling. Rfit does not, have the unit

adjusted by an authorized service technician.

• Be sure the tines are not in contact with anything

before starting the unit.

Use the unit only in daylight or good artificial light.

Avoid accidental starting. The operator and unit must

be in a stable position while starting. See

Starting/Stopping Instructions.

• Use the right tool. Only use this tool for the purpose

intended.

• Use extreme caution when reversing or pulling the unit

towards you.

Do not overreach. Always keep proper footing and

balance. Take extra care when working on steep

slopes or inclines.

• Always hold the unit with both hands when operating.

Keep a firm grip on the grips.

Keep hands, face, and feet at a distance from all

moving parts. Do not touch or try to stop the tines

when they are rotating.

Do not touch the engine or muffler. These parts get

extremely hot from operation. They remain hot for a

short time after you turn off the unit.

Do not operate the engine faster than the speed

needed to cultivate. Do not run the engine at high

speed when you are not cultivating.

Always stop the engine when cultivating is delayed or

when walking from one location to another.

If you strike or become entangled with a foreign

object, stop the engine immediately and check for

damage. Do not operate before repairing damage. Do

not operate the unit with loose or damaged parts.

Stop and switch the engine to off for maintenance,

repair, or to install or remove the tines.

Use only original equipment manufacturer

replacement parts and accessories for this unit. These

are available from your authorized service dealer. Use

of any unauthorized parts or accessories could lead to

serious injury to the user, or damage to the unit, and

void your warranty.

Keep unit clean of vegetation and other materials.

They may become lodged between the tines.

To reduce fire hazard, replace faulty muffler and spark

arrestor, keep the engine and muffler free from grass,

leaves, excessive grease or carbon build up.

OTHER SAFETY WARNmNGS

Never store the unit, with fuel in the tank, inside a

building where fumes may reach an open flame or

spark,

• Allow the engine to cool before storing or transporting.

Be sure to secure the unit while transporting.

Store the unit in a dry area, locked up or up high

to prevent unauthorized use or damage, out of the

reach of children.

Never douse or squirt the unit with water or any other

liquid. Keep handles dry, clean and free from debris.

Clean after each use. See the Cleaning and Storage

instructions.

Keep these instructions. Refer to them often and use

them to instruct other users, if you loan someone this

unit, also loan them these instructions.

SAVE THESE

SAFETY AND _NTERNAT_ONAL SYMBOLS

This operator's manual describes safety and international symbols and pictographs that may appear on this product,

Read the operator's manual for complete safety, assembly, operating and maintenance and repair information.

SYMBOL MEANmNG SYMBOL MEANmNG

__, , SAFETY ALERT SYMBOL I

Indicates danger, warning or caution.

May be used in conjunction with other

symbols or pictographs.

• ON/OFF STOP CONTROL

ON / START / RUN

WARNING - READ

OPERATOR'S MANUAL

Read the operator's manual(s) and

follow all warnings and safety'

instructions. Failure to do so can result

in serious injury to the operator and/or

bystanders.

WEAR EYE AND HEARING

PROTECTION

WARNING: Thrown objects and loud

noise can cause severe eye injury and

hearing loss. Wear eye protection

meeting ANSI Z87.1 standards and

ear protection when operating this

unit. Use a full face shield when

needed.

, KEEP BYSTANDERS AWAY

WARNING: Keep all bystanders,

especially children and pets, at least

50 feet (15 m) from the operating area.

, UNLEADED FUEL

Always use clean, fresh unleaded fuel.

1 2

1',1

, ON/OFF STOP CONTROL

OFF or STOP

', HOT SURFACE WARNING

Do not touch a hot muffler, gear

housing or cylinder. You may get

burned. These parts get extremely hot

from operation. They remain hot for a

short time after the unit is turned off.

• CHOKE CONTROL

1 , FULL choke position.

2 _ PARTIAL choke position.

3, RUN position.

GARDEN CULTIVATORS -

ROTATING TINES CAN CAUSE

SEVERE iNJURY

WARNING: Stop the engine and allow

the tines to stop before installing or

removing tines, or before cleaning or

performing any maintenance. Keep

hands and feet away from rotating

tines.

, OIL

Refer to operator's manual for the

proper type of oil.

,THROWN OBJECTS AND

ROTATING CUTTER DAN CAUSE

SEVEREINJURY

WARNING: Do not operate without

the proper attachments and guards in

place. Keep away from the rotating

tines.

, NO STEP

Always keep proper footing and

balance. Do not overreach, take extra

care when working on steep slopes or

inclines.

, PLACE LEFT FOOT HERE

Avoid accidental starting. Stand in the

starting position whenever pulling the

starter rope. The operator and unit

must be in a stable position while

starting.

• CuHtivatingsodandHighttomediumsoi[

• CuHtivatingingardenareas,aroundtrees,etc,

Handgrip

Throttle

Control

Throttle

Cable and

Switch Wires

Handmebar

Knob

Primer Bumb

Blue Choke

Lever

Spark

Pmug

Muffler

Wheel Bracket /

Assembmy

Air Filter/

Muffler

Cover

STOP/OFF (0)

On/Off Stop

Control

START/ON (I)

FuemCap

Starter Rope Grip

Handlebar

Knob

Shaft Tube Grip

Tine Guard

Gearbox

ASSEMBLmNG THE UNmT

Before operating, position the unit's handHebars.

NOTE: You may also need to reposition the wheeHheight

before using the cuHtivator. Refer to the Adjusting

Tine Depth section.

Begin by carefully unpacking the contents and making

sure that nothing is damaged.

POSmTmONmNGTHE HANDLEBARS

1. Loosen the two knobs on the inside of the

handHebars (Fig. 1).

2. With the unit upright, swing the handHebars up into

the operating position (Fig. 1).

NOTE: Take care not to pinch the throttHe came or

switch wires when positioning the handHebar.

3. Tighten the knobs to secure the handHebars in pHace.

NOTE: Do not over-tighten the knobs.

Readjust the throttle cable and switch the wires so

they are smooth and tight against the handlebar

assembly. This will help prevent them from catching

or snagging during normal operation.

Handmebar

Knobs

Handlebar

Knobs

iNSTALLiNG THE WHEEL BRACKET

ASSEMBLY

If the wheel bracket assembly is not installed, or if you

ever need to remove or reinstall it, follow the ensuing

instructions.

WARNmNG: Toavoid njuryfrom

the tines, wear

heavy gloves and a long sleeve shirt when

installing the wheel bracket assembly.

WARNmNG: Toprevent serious

personal injury, the

wheel bracket assembly must be installed

when operating the unit.

1. With the unit on its side, place the wheel bracket

assembly on the underside of the tine guard (Fig. 3).

2. install a carriage bolt through each of the slotted

holes in the wheel bracket and into the tine guard.

3. On the TOP side of the tine guard, install a lock

washer and a wing nut onto each of the bolts (Fig. 3).

4. Make sure the square shoulder of the bolts is pushed

through the slotted holes in the wheel bracket.

Tighten the wing nuts (Fig. 4).

NOTE: Do not over-tighten the wing nuts. Loosen the

wing nuts to adjust wheel height.

Tine

Guard

Wheel

Bracket

Assembly

F_g. 1

Wing Nut &

Lock Washer

F_g. 3

Washer

_1[_\ Handmebar

ebars

F_g.2

F_g. 4

OIL AND FUEL MIXING INSTRUCTIONS

Old and/or improperly mixed fuel are the main reasons

for the unit not running properly. Be sure to use fresh,

clean unleaded fuel. Follow the instructions carefully for

the proper fueVoil mixture.

Definition of Bmended Fuels

Today's fueis are often a Mend of gasoiine and

oxygenates such as ethanol, methanol, or MTBE (ether).

Alcohol-blended fuel absorbs water. As little as 1%

water in the fue[ can make rue[ and oi[ separate, it forms

acids when stored, When using alcohol-blended fuel,

use fresh rue[ (Hessthan 60 days oid).

Using Bmended Fuems

if you choose to use a Mended fuel or its use is

unavoidabb, follow recommended precautions:

• AJways use the fresh fuel mix explained in your

operator's manual

• Always agitate the fuel mix before fueling the unit

, Drain the tank and run the engine dry before storing

the unit

Using FuemAdditives

The bottle of 2-cycb oil that came with your unit

contains a fuel additive which will help inhibit corrosion

and minimize the formation of gum deposits. It is

recommended that you use our 2-cycb oil with this unit.

If unavailable, use a good 2-cycle oil designed for

air-coobd engines along with a fuel additive, such as

STA-BIL" Gas Stabilizer or an equivalent, Add 0.8 oz.

(23 ml.) of fuel additive per gallon of fuel according to the

instructions on the container. NEVER add fuel additives

directly to the unit's fuel tank,

, For proper engine

• operation and

maximum reliability, pay strict attention to

the oil and fuel mixing instructions on the

2-cycle oil container, Using improperly mixed

fuel can severely damage the engine,

UNLEADED GAS

1 GALLON US

(S.8LITERS)

1 LITER

MiXiNG RATIO - 40:1

2 CYCLE OIL

3.2 FL OZ.

(95 ram)

zsmm

WARNING: Gaso,ineis

extremely

flammable, ignited Vapors may explode.

Always stop the engine and allow it to cool

the fuel tank. Do not smoke

WARNING: Removefuel cap

slowly to avoid injury

from fuel spray. Never operate the unit

without the fuel cap securely in place,

WARNING: Add fuel in a clean,

well ventilated

outdoor area. Wipe up any spilled fuel

until fuel vapors dissipate.

NOTE: Dispose of the old fuel/oil mix in accordance to

Federal, State and Local regulations.

FiLLiNG THE FUEL TANK

Make sure the cultivator is in a horizontal position when

filling or adding fuel to the tank.

Thoroughly mix the proper ratio of 2-cycle engine oil

with unleaded gasoline in a separate fuel can. Use a 40:1

fuel/oil ratio. Do not mix them directly in the engine fuel

tank. See the table below for specific gas and oil mixing

ratios.

NOTE: One gallon (3.8 liters) of unleaded gasoline mixed

with one 3.2 oz. (95 ml.) bottle of

2-cycle oil makes a 40:1 fuel/oil ratio.

Fig. 5

WARNING: Operatethisunitonly

ina well-ventilated

outdoorarea,Carbon monoxide exhaustfumes

can be lethalina confinedarea.

WARNING: Avoidacddental

starting. Make sure

you are in the starting position when pulling

the starter rope (Fig. 8), To avoid serious injury,

the operator and unit must be in a stable

position while starting.

STARTING iNSTRUCTiONS

1. Mix gas with oil. Fill fuel tank with fuel/oil mixture.

Refer to Oil and Fuel Mixing Instructions.

2. Make sure the On/Off Stop Control in the ON [1]

position (Fig. 6).

3. Place the blue choke lever in Position 1 (Fig. 7).

4. Fully press and release the primer bulb 10 times,

slowly. Some amount of fuel should be visible in

the primer bulb and fuel lines (Fig. 7). If you can't

see fuel in the bulb, press and release the bulb as

many times as it takes before you can see fuel in it.

5. Stand between the handlebars and support the unit

by placing your left foot on the wheel bracket

assembly and gripping the handlebar grip with your

right hand (Fig. 8).

NOTE: Tilt the unit back slightly to bring the tines off the

ground when starting.

6. While squeezing the throttle control to the wide open

(full throttle) position, grasp the starter rope grip with

your left hand. Pull the starter rope out a short

distance, until you feel some resistance. This is usually

around 2-4 inches. Then pull the rope smoothly and

briskly. Repeat this 5 times.

7. Move the blue choke lever to Position 2.

8. While squeezing the throttle control, pull the starter

rope in the same manner as explained in Step 6.

Pull 1 to 3 times to start the engine.

9. Keep the throttle squeezed and allow the engine to

warm up for 15 to 30 seconds.

10. Place the blue choke lever in Position 3. Release the

throttle control to the idle position and begin

operation.

JFo.. The engine does not start, go back to step 3.

JFoooThe engine fails to start after a few attempts, place

the blue choke lever in Position 3 and squeeze the

throttle control. Pull the starter rope briskly 3 to 8

times. The engine should start. If not, repeat.

JF WARM... If the engine is already warm, make sure

the On/Off Stop control is in the ON position and

start the unit with the blue choke lever in Position

2. After the unit starts, move the blue choke lever

to Position 3.

OFF (0)

On/Off Stop Controm

ThrottJe Control

F_g. 6

_-- Position 2

Position 3

Blue Choke Lever

Primer Bulb

Starter

Rope

Throttle

ControJ

F_g. 8

STOPPING iNSTRUCTiONS

1. Release your hand from the throttle control. Allow

the engine to cool down by idling.

2. Put the On/Off Stop Control in the STOP (O)

position.

OPERATING TraPS

WARNmNG: Dress properHyto

reduce the riskof

injury when operating this unit. Do not

wear bose cHotNng orjeweHry. Wear eye

and ear/heating protection. Wear heavy

Hongpants, boots and gHoves. Do not wear

short pants, sandaHs or operate barefoot.

Move the cultivator to the work area prior to starting the

engine. Transport the cultivator by pushing it on its

wheels.

WARNmNG: Toprevent serious

persona] injury,

never pick-up or carry the unit while the

engine is running.

2. Start the unit as described in the Starting Instructions

3. With the engine running and the tines off the ground,

depress the throttle controi to increase the engine speed.

4. HoHding both of the handHebar grips firmHy,showily

Howerthe cultivator untiHthe tines make contact with

the ground (Fig. 9).

5. As cuHtivating action begins, puHHback on the

cuHtivator so that the tines can penetrate the ground.

6. Once the ground has been broken, continue at a

moderate pace untiHyou are familiar with the controHs

and the handHingof the cuHtivator.

WARNING: Toprevent serious

personalinjury, use

extreme cautionwhen reversing

orpullingthe unittowards you,

7. Pull the cultivator backwards to improve the depth of

cultivation and reduce your effort.

8. If the tines are digging too deep or not deep enough,

adjust them according to Adjusting Tine Depth.

_-J,#_.Jv/

ADJUSTING TINE DEPTH

Tine adjustment will vary depending on the type of soil

being cultivated and how it will be used. Generally,

adjusting the tines to break the soil 4 to 6 inches is

recommended for most gardens. Adjust the tines as

follows:

1. Stop the engine and disconnect the spark plug wire.

2. Loosen (do not remove) the two wing nuts on the

tine guard (Fig. 10).

3. SHidethe wheeHbracket assembHy down for shaHHower

penetration, and up for deeper tine penetration.

4. Once the tines are in the desired position, tighten the

wing nuts, making sure that the carriage boHtsare

seated properHy through the bracket.

5. If the tine depth is incorrect, repeat steps 2 to 4.

6. Reconnect the spark pHugwire and continue use.

Down

/ /

Fig. 10

TRANSPORTING THE UNIT

WARNING: Toprevent serious

personaH injury,

aHways stop the engine when operation is

deHayed or when transporting the unit from

one Hocation to another

1. Stop the engine.

2. Slide the wheel bracket assembly all the way down.

3. TiHtthe unit back untiHthe tines dear the ground.

4. Push or puHHthe unit to the next Hocation.

Fig. 9

MAINTENANCE SCHEDULE

Perform these required maintenance procedures at the

frequency stated in the tabb, These procedures should

also be a part of any seasonal tune-up,

NOTE: Some maintenance procedures may require

special tools or skills. If you are unsure

about these procedures take your unit to

any non-road engine repair establishment,

individual or authorized service deabr.

WARNING: To prevent serious

inJury, never perform

maintenance or repairs with unit running.

Always service and repair a cool unit.

Disconnect the spark plug wire to ensure that

the unit cannot start.

NOTE: Maintenance, replacement, or repair of the emission

control devices and system may be performed by

any non-road engine repair establishment, individual

or authorized service deaier.

In order to assure peak performance of your engine,

inspection of the engine exhaust port may be necessary

after 50 hours of operation. If you notice lost RPM, poor

performance or general lack of acceleration, this service

may be required, If you feel your engine is in need of this

inspection, refer service to any non-road engine repair

establishment, individual or authorized service dealer for

repair. DO NOT attempt to perform this process yourself

as engine damage may result from contaminants

involved in the cleaning process for the port,

FREQUENCY MAINTENANCE REQUIRED REFER TO

Before starting engine Fill fuel tank with fresh fuel mix Page 8

Every 10 hours Clean and re-oil air filter Page 12

Check and clean spark arrestor Page 12

Every 25 hours

Check spark plug condition and gap Page 13

Inspect exhaust port and spark arrestor screen for clogging or Page 12

Every 50 hours obstruction to assure maximum performance levels

TINE REMOVAL AND REPLACEMENT

Replace all four (4) tines at the same time, because they

will wear evenly through normal use, Work on one side

at a time.

WARNING: Toprevent serious

personal injury,

always wear heavy gloves when handling

the tines.

Put the On/Off Stop Control in the STOP (O) position

and disconnect the spark plug wire,

Remove the clevis pin clips and clevis pins (Fig, 11),

Remove the tines and felt washers from the shaft.

Clean and oil the shaft,

The tines are stamped with the letter "R" or "L" to

identified their position on each side of the gearbox

when facing the front of the unit,

Replace the tines and felt washers onto the shaft

with the hubs on the tines facing each other,

Tine "

Hubs ' -, Cmevis Pin Clip

Fig. 11

7. Before you reinstall the clevis pins and pin clips,

ensure that the tips on the tines are staggered when

compared to each other (Fig. 12).

8. Repeat this procedure on the opposite side.

NOTE: When installed correctly, there wiii be an "R" and

"L" tine on both the sides of the gearbox and the

tips of the tines. These letters wiii line up in the

same direction for each side. It is important that

the tines are installed correctly.

Fig. 12

Stagger Tips

AIR FILTER MAINTENANCE

Removing the Air Filter/Muffler Cover

WARNING: Toavoid

personal injury,

always turn the unit off and allow it to cool

before you clean or service it.

1. Place the blue choke lever in Position 2.

NOTE: The blue choke lever must be in Position 2

(Fig. 13) to remove the air filter/muffler cover.

2. Remove the four (4) screws securing the air

filter/muffler cover (Fig. 13). Use a # T20 Torx bit

screwdriver.

3. Pull the cover from the engine. Do not force.

Blue Choke

Lever

\ I I J

Fig. 13

Posffion 2

Screws

Cleaning the Air Filter

Clean and re-oil the air filter every 10 hours of operation.

It is an important item to maintain. Failure to maintain

your air filter properly can result in poor performance or

can cause permanent damage to your engine.

1. Remove the air filter/muffler cover. Refer to the

Removing the Air filter/Muffler Cover section.

2. Remove the air filter from inside the air filter/muffler

cover (Fig. 14).

3. Wash the filter in detergent and water (Fig. 14). Rinse

the filter thoroughly. Squeeze out excess water.

Allow it to dry completely.

4. Apply enough SAE 30 oii to lightly coat the filter (Fig. 15).

5. Squeeze the filter to spread and remove extra oil (Fig. 15).

6. Replace the air filter inside the muffler cover (Fig. 14).

NOTE: Operating the unit without the air filter and cover

assembly will VOID the warranty.

Reinstalling the Air filter/Muffler Cover

1. Place the air filter/muffler cover over the back of the

carburetor and muffler.

NOTE: The blue choke lever must be in Postion 2 (Fig.

13) to remove the air filter/muffler cover.

2. Insert the four (4) screws into the holes in the air filter/

muffler cover (Fig. 13) and tighten. Use a # T20 Torx

bit screwdriver. Do not over tighten. Do not force.

Air Filter

/' Inside Muffler

Cover

Fig. 14

Fig. 15

SPARK ARRESTOR MAINTENANCE

1. Remove air filter/muffler cover. Refer to Removing

the Air Filter/Muffler Cover.

Locate the muffler, but do not remove it. Find the

screw on the bottom of the muffler (Fig. 16). Remove

the screw using either a torx #20 or flat blade

screwdriver.

3. Carefully pry up the left side spark arrestor hood.

Two tabs act as hinges on the right side of the hood.

Flip open the spark arrestor hood like a door and

then pull its tabs out of the muffler slots.

4. Using a small flat blade screwdriver, carefully pry the

spark arrestor screen out from the inside of the spark

arrestor hood.

5. Clean the spark arrestor screen with a wire brush.

Replace it if it is damaged, or if you are unable to

clean it thoroughly.

6. Reinstall the spark arrestor screen snugly back into

the spark arrestor hood.

7. Reinstall the two hood tabs into the two muffler slots

and flip the spark arrestor hood closed.

8. Replace the screw you removed in Step 2 and tighten

it securely.

9. Reinstall the air filter/muffler cover.

WARNING: Ifthee×haust

deflector assembly is

not tightened securely, it could fall off causing

damage to the unit and possible serious

personal injury,

Spark Arrestor

Hood

Slots

Engine

Screw

Spark Arrestor

Tabs Screen

Muffler

Fig. 16

CARBURETOR ADJUSTMENTS

The engine's idle speed adjuster is adjustable through

the air filter/muffler cover (Fig 17).

NOTE: Careless adjustments can seriously damage your

unit, An authorized service dealer should make

carburetor adjustments.

Check Fuel Mixture

Old and/or improperly mixed fuel is usually the reason

for the unit not running properly. Drain and refill the tank

with fresh, properly mixed fuel prior to making any

adjustments. Refer to Of and Fuel Information.

Clean Air Filter

The condition of the air filter is important to the operation

of the unit, A dirty air filter will restrict air flow and

change the air/fuel mixture. This is often mistaken for an

out of adjustment carburetor. Check the condition of the

air filter before adjusting the idle speed adjuster, Refer to

ALr Filter Maintenance,

WARNING: Theunitwillstillrun

during idle speed

adjustments, Wear protective clothing and

observe all safetv instructions to prevent

serious personal injury.

Adjust Idle Speed Adjuster

If after checking the fuel mixture and cleaning the air

filter the engine still will not idle, adjust the idle speed

screw as follows:

1. Start the engine and let it run for about 2-3 minutes

at a high speed (full throttle) to warm up. Refer to the

Starting/Stopping Instructions.

NOTE: Ensure the tines are not in contact with the

ground when adjusting the idle.

2. Release the throttle control and let the engine idle, If

idle speed screw clockwise 1/8 of a turn at a time

(as needed) until the engine idles smoothly.

NOTE: The tines should not rotate during engine idle.

3. If the tines rotate when the engine idles, turn the idle

speed screw counterclockwise 1/8 of a turn at a

time (as needed), to reduce idle speed.

Checking the fuel mixture, cleaning the air filter, and

adjusting the idle speed screw should solve most engine

problems, If not and all the following are true:

• The engine will not idle

• The engine hesitates or stalls on acceleration

• There is a loss of engine power

Havethe carburetor adjusted by an authorized service dealer.

IdmeSpeed Adjuster

Fig. 17

REPLACING THE SPARK PLUG

Use a Champion RDJ7Y spark plug (or equivalent). The

correct air gap is 0.020 in. (0.5 mm). Remove the ph_g

after every 25 hours of operation to check its condition.

1. Stop the engine and allow it to cool. Grasp the plug

wire firmly and pull the cap from the spark plug.

2. Clean dirt from around the spark plug. Remove the

spark plug from the cylinder head by turning a 5/8 in.

socket counterclockwise.

NOTE: Replace a cracked, fouled or dirty spark plug.

3. Set the air gap at 0,020 in. (0.5 mm) using a feeler

gauge (Fig. 18).

Do not sand blast, /

scrape or clean

CAUTION: enginec°ulddamagel

electrodes.Gritinthe

the cylinder.

0,020 in.

(0.5 ram)

Fig. 18

4. hstalI a correctly gapped spark plug in the cylinder

head, Tighten by turning the 5/8 in. socket clockwise

until snug,

If using a torque wrench torque to:

110-120 in,olb. (12.3-13.5 N,m)

Do not over tighten.

CLEANING THE UNIT

before you dean or service it.

Use a small brush to dean off the outside of the unit

and to keep the air vents free of obstructions.

Do not use strong detergents or petroHeum based

cHeaners, Hikekerosene. Some househoHd cHeaners

contain aromatic oiHssuch as pine and [emon that

can damage the pHastic housings or handHes.Wipe

off any moisture with a soft c[oth.

STORAGE

• Never store a fueled unit where fumes may reach an

open flame or spark.

• AHHowthe engine to cool before storing.

• Store the unit in a locked up area to prevent

unauthorized use or damage.

Store the unit in a dry, well-ventilated area.

Store the unit out of the reach of children.

LONG TERM STORAGE

If you plan to store the unit for an extended time:

1. Drain all fuel from the fuel tank into a container. Do

not use fuel that has been stored for more than 60

days. Dispose of the old fuel in accordance to local

regulations.

2. Start the engine and allow it to run until it stalls. This

ensures that all fuel has been drained from the

carburetor.

3. AHow the engine to coo[. Remove the spark plug and

put 1 oz. (30 m0 of high quality motor oil into the

cylinder. Pull the starter rope slowly to distribute the

oil. Reinstall the spark plug.

NOTE: Remove the spark plug and drain all of the oil

from the cylinder before attempting to start the

unit after storage.

ThorougMy dean the unit and inspect for any loose

or damaged parts. Repair or replace damaged parts

and tighten loose screws, nuts or bolts. The unit is

ready for storage.

TRANSPORTING

• Allow the engine to cool before transporting.

• Secure the unit while transporting.

• Drain the fuel tank before transporting.

• Tighten fuel cap before transporting.

MOVING THE UNIT

1. Allow the unit to cool before moving.

2. Loosen the knobs on the handlebar,

3, Fold the handlebars down as shown (Fig. 19),

Knobs

Fig. 19

4. Either carry the unit by the shaft tube grip or grasp

the center of the handlebar to use it as a carrying

handle (Fig. 20).

5. After the unit has been moved, reposition the

handlebars and continue operation.

Shaft Tube

Grip

CAUSE

Empty fuel tank

Primer bulb wasn't pressed enough

Engine is flooded

Old or improperly mixed fuel

Fouled spark plug

Mugged spark arrestor

CAUSE

Airfilterisplugged

Old or improperlymixed fuel

Improper carburetor adjustment

CAUSE

Old or improperlymixed fuel

Improper carburetor adjustment

Tines bound with grass

Mugged spark arrestor

CAUSE

Old or improperlymixed fuel

Improper carburetor adjustment

Fouled spark plug

Mugged spark arrestor

ACTION

Fi[[fueltankwithproperlymixed fuel

Press primer bulb fully and slowly 10 times

Squeeze the trigger and pu[[ the starter rope

Drain gas tank and add fresh fuel mixture

Replace or dean the spark plug

Clean or replace spark arrestor

ACTION

Replaceordean theairfilter

Drain gas tank and add fresh fuel mixture

Adjust according to the Carburetor Adjustments section

ACTION

Drain gas tank and add fresh fuel mixture

Take to an authorized service dealer for an adjustment

Stop the engine and dean the tines

Clean or replace the air filter

Clean or replace spark arrestor

ACTION

Drain gas tank and add fresh fuel mixture

Take to an authorized service dealer for an adjustment

Replace or dean the spark plug

Clean or replace spark arrestor

If further assistance is required, contact your authorized service dealer.

EngineType...........................................................................................................................................Air-CooHed,2-Cycle

DispHacement .............................................................................................................................................................. 31 cc

IdHeSpeed RPM ......................................................................................................................................... 2,600-3,600 rpm

Operating RPM ................................................................................................................................................... 7,800+ rpm

CHutch Type ......................................................................................................................................................... CentrifugaH

Ignition Type .......................................................................................................................................................... EHectronic

On/Off Stop ControH....................................................................................................................................... Rocker Switch

Spark Hug Gap .................................................................................................................................... 0,020 inch (0.5 mm)

Lubrication ................................................................................................................................................... FueFOiHMixture

FueHiOiHRatio .................................................................................................................................................................. 40:1

Carburetor ....................................................................................................................................... Diaphragm, AH-Position

Starter ............................................................................................................................................................... Auto Rewind

Muffler ..................................................................................................................................................... BaffHedwith Guard

ThrottHe............................................................................................................................................................ Spring Return

FueHTank Capacity ................................................................................................................................. 14 ounces (415 mH)

Drive Shaft Tube .................................................................................................................................................. SteeHTube

ThrottHe ControH ........................................................................................................................................ Finger-Tip Trigger

CuHtivating Path Width (Maximum) ....................................................................................................... 9 inches (22.86 cm)

CuHtivating Depth (Maximum) ............................................................................................................... 6 inches (15.24 cm)

Approximate Weight (no fueH) ......................................................................................................................... 26 lb. (12 kg)

_AIIspecifications are based on the latest product information available at the time of printing. We reserve the right to

make changes at any time without notice.

California i EPA Emission Control Warranty Statement

Your Warranty Rights and Obligations

The California Air Resources Board, the Envkonmentd Protection Agency and MTD LLC (MTD) are pHeased to expHain

the emission controH system warranty on your 2000 and HatersmaHHoff-road engine. New small off-road engines must be

designed, buiHtand equipped to meet stringent anti-smog standards. MTD must warrant the emission controH system on

your smaHHoff-road engine for the periods of time Histedbellow provided there has been no abuse, negHector improper

maintenance of your small off-road engine.

Your emission controH system may incHude parts such as the carburetor or fueH-injected system, the ignition system, and

cataHytic converter. AHsoincHuded may be hoses, beHts,connectors and other emission-reHated assemblies.

Where a warrantable condition exists, MTD will repair your small off-road engine at no cost to you including diagnosis,

parts and labor.

The 2000 and later small off-road enginesare warranted for two years. If any emission-related part on your engine is

defective, the part will be repaired or replaced by MTD.

Owners Warranty Responsibilities

• As the small off-road engine owner, you are responsible for the performance of the required maintenance listed in your

operator's manual. MTD recommends that you retain all receipts covering maintenance on your small off-road engine,

but MTD cannot deny warranty solely for the lack of receipts or for your failure to ensure the performance of all

scheduled maintenance.

• As the small off-road engine owner, you however should be aware that MTD may deny you warranty coverage if your

small off-road engine or a part has failed due to abuse, neglect, improper maintenance or unapproved modifications.

• You are responsible for presenting your small off-road engine to a MTD Authorized Service Center as soon as a

problem exists. The warranty repairs should be completed in a reasonable amount of time, not to exceed 30 days.

If you have any questions regarding your warranty rights and responsibilities, you should call 1-800-345-8746.

Manufacturer's Warranty Coverage

• The warranty period begins on the date the engine or equipment is delivered to the retail purchaser.

• The manufacturer warrants to the initial owner and each subsequent purchaser, that the engine is free from defects in

material and workmanship which cause the failure of a warranted part for a period of two years.

• Repair or replacement of warranted part will be performed at no charge to the owner at an Authorized MTD Service

Center. For the nearest location please contact MTD at: 1-800-345-8746.

• Any warranted part which is not scheduled for replacement, as required maintenance or which is scheduled for only

for regular inspection to the effect of "Repair or Replace as Necessary" is warranted for the warranty period. Any

warranted part which is scheduled for replacement as required maintenance will be warranted for the period of time up

to the first scheduled replacement point for that part.

, The owner wi[[ not be charged for diagnostic [abor which [eads to the determination that a warranted part is defective,

if the diagnostic work is performed at an Authorized MTD Service Center.

• The manufacturer is liable for damages to other engine components caused by the failure of a warranted part still

under warranty.

• Failures caused by abuse, neglect or improper maintenance are not covered under warranty.

• The use of add-on or modified parts can be grounds for disallowing a warranty claim. The manufacturer is not liable to

cover failures of warranted parts caused by the use of add-on or modified parts.

• In order to file a claim, go to your nearest Authorized MTD Service Center. Warranty services or repairs will be

provided at all Authorized MTD Service Centers.

• Any manufacturer approved replacement part may be used in the performance of any warranty maintenance or repair

of emission related parts and will be provided without charge to the owner. Any replacement part that is equivalent in

performance or durability may be used in non-warranty maintenance or repair and will not reduce the warranty

obligations of the manufacturer

• The following components are included in the emission related warranty of the engine, air filter, carburetor, primer, fuel

lines, fuel pick up/fuel filter, ignition module, spark plug and muffler.

MANUFACTURER'S LIMITED WARRANTY FOR:

The limited warranty set forth below is given by MTD

LLC ("MTD") with respect to new merchandise purchased and

used in the United States, its possessions and territories.

MTD warrants this product against defects in material and

workmanship for a period of two (2) years commencing on the

date of original purchase and will, at its option, repair or

replace, free of charge, an},' part found to be defective in

material or workmanship. This limited warranty shall only apply

if this product has been operated and maintained in

accordance with the Operator's Manual furnished with the

product, and has not been subject to misuse, abuse,

commercial use, neglect, accident, improper maintenance,

alteration, vandalism, theft, fire, water or damage because of

other peril or natural disaster. Damage resulting from the

installation or use of any accessory or attachment not

approved by MTD for use with the product(s) covered by this

manual will void your warranty as to any resulting damage. This

warranty is limited to ninety (90) days from the date of original

retail purchase for any MTD product that is used for rental or

commercial purposes, or any other income-producing purpose.

HOW TO OBTAIN SERVICE: Warranty service is available,

WITH PROOF OF PURCHASE THROUGH YOUR LOCAL

AUTHORIZED SERVICE DEALER. To locate the dealer in your

area, please check ff)r a listing in the Yellow Pages or contact

the Customer Service Department of MTD LLC by calling

1-800-345-8746 or writing to P.O. Box 361131, Cleveland OH

44136-0019 or if in Canada call 1-800-668-1238. No product

returned directly to the factor},' will be accepted unless prior

written permission has been extended by the Customer

Service Department of MTD LLC.

This limited warranty does riot provide coverage in the

following cases:

A. Tune-ups - Spark Plugs, Carburetor Adiustments, Filters.

B. Wear items - Bump Knobs, Outer Spools, Cutting Line,

Inner Reels, Starter Pulley, Starter Ropes, Drive Belts.

MTD does not extend an},' warrant},' for products sold or

exported outside of the United States of America, its

possessions and territories, except those sold through

MTD's authorized channels of export distribution.

MTD reserves the right to change or improve the design of

an},' MTD Product without assuming any obligation to modify

any product previously manufactured.

No implied warranty, including any implied warranty of

merchantability or fitness for a particular purpose,

applies after the applicable period of express written

warranty above as to the parts as identified. No other

express warranty or guaranty, whether written or oral,

except as mentioned above, given by any person or

entity, including a dealer or retailer, with respect to any

product shall bind [v1TB. During the period of the

Warranty, the exclusive remedy is repair or replacement

of the product as set forth above. (Some states do not

allow limitations on how long an implied warranty lasts, so

the above limitation may not apply to you.)

The provisions as set forth in this Warranty provide the

sole and exclusive remedy arising from the sales. IVJTD

shall not be liable for incidental or consequential loss or

damages including, without limitation, expenses incurred

for substitute or replacement lawn care services, for

transportation or for related expenses, or for rental

expenses to temporarily replace a warranted product.

(Some states do not allow limitations on how long an implied

warranty lasts, so the above limitation may not apply to you.)

In no event shall recovery of any kind be greater than the

amount of the purchase price of the product sold. Alteration

of the safety features of the product shall void this Warranty.

You assume the risk and liability for loss, damage, or injury

to you and your property and/or to others and their property

arising out of the use or misuse or inability to use the

product.

This limited warrant},' shall not extend to anyone other than

the original purchaser, original lessee or the person for whom

it was purchased as a gift.

How State Law Relates to this Warranty: This warranty

gives you specific legal rights, and you may also have other

rights which vary from state to state.

To locate },'our nearest service dealer dial 1-800-345-8746

in the United States or 1-800-668-1238 in Canada.

RO. Box 361131

Cleveland, OH 44136-0019

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Bolens 21B-121R765 Owner's manual

Brand: Bolens

Model: 21B-121R765

Category: Garden tools

Type: Owner's manual

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Bolens 21B-121R765 Owner's manual

Bolens 21B-121R765 Owner's manual

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